My build:

Windows Vista Home Premium 64-bit
LG DVD Drive
Gfx card (9800 GT)
Intel Core 2 Duo E7200
Western Digital HDD
G.SKILL 2x1 GB DDR2 1066 Memory
Asus Motherboard
Generic Case
Antec NeoPower 550

The crashes seem to happen at random and with different errors.

Also, if it crashes, I've found continued use will result in another crash fairly quickly.

My computer is spyware free. I've checked the memory with memtest and Vista's built in memory checker. My power supply is powerful enough (or so I'm told).

What other information do you guys need to help find my problem?

I had a similar problem and it happened to be the memory, some kind of incompatibility with the motherboard, the memory was good. After I replaced it everything worked fine. I suspect your memory to be the cause since you get different errors everytime.

My mobo is an ASRock P43 Twins 1600 which is fully compatible with DDR2 1066.

mine said it was fully compatible with ddr2 800, butit just didn't want those chips I was using. Like I said the memory was good and the mobo was supposed to accept it but it didn't.

i have to agree,had a similar problem and it turned out to be the memory